I bought a Triangle Tube Challenger Solo cc125 boiler and the installation instructions shows multiple zones. However, I can only see one set of thermostat terminals in the on-board wiring. Do I have to add zone controls to use three circulator pumps and three thermostats?
For a multiple zone installation, each zone will require a thermostat in that zone to control a zone valve with an end switch to turn the boiler on/off or a thermostat to control the boiler and each pump. each pump will have to be coupled with a flow control valve. d george